This is a discussion on What The F*&% is wrong??! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; When at 5-7k rpm's in 2nd, 3rd, and, 4th gear, my completely stock '04 WRX spudders.. it wont go through ...

What The F*&% is wrong??!

When at 5-7k rpm's in 2nd, 3rd, and, 4th gear, my completely stock '04 WRX spudders.. it wont go through the 5-7k rpm range smothly, it seems like a transmission problem almost like it's slipping but i dont feel anything on the shifter just the engine spudders. It came up with an check engine light once.
Whats wrong!!??

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I did accidentally fill it with non-premium gas a tank ago so i added two octaine boost bottles to try to get it back up to premium intead of dumping the tank of non-premium gas, and when that tank was 2/3 gone it started to do this. I have used premium every tank before, I just goofed on that one.

Remove the battery cable and depress the brake for a few seconds. Octane booster doesn't really work BTW.. unless you used like a gallon of toluene, that's what I used to use as injector cleaner/octane booster.

I did accidentally fill it with non-premium gas a tank ago so i added two octaine boost bottles to try to get it back up to premium intead of dumping the tank of non-premium gas, and when that tank was 2/3 gone it started to do this. I have used premium every tank before, I just goofed on that one.

For future reference.....do not do this, ever. A $50 tank of gas is nothing compared to blowing a motor. My guess is that is exactly what caused your problem

For future reference.....do not do this, ever. A $50 tank of gas is nothing compared to blowing a motor. My guess is that is exactly what caused your problem

Theoretically you could fill your tank with 87 and as long as you don't beat on the car and stay out of boost it will be fine until you can run enough out to top it off with 93. I'm guessing there was a WOT event (or several) with the bad gas that was a precursor to the problem.

Theoretically you could fill your tank with 87 and as long as you don't beat on the car and stay out of boost it will be fine until you can run enough out to top it off with 93. I'm guessing there was a WOT event (or several) with the bad gas that was a precursor to the problem.

Theoretically yes, I still would never do that though. Anything other than 91 goes into my tank (Colorado doesn't have 93) and its getting drained.

Im having the fuel emptied today, My plan is to fill up with premium, change out the spark plugs (its about time anyways), then reset the ecu... Ive been keeping it under 3k rpms lately, does anyone think I did any real damage? I ll get the check engine code today too and post it.

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